wiring harness on a mazda

i have a question here if someone can help me out i want to get this motorin my truck soon and i was wondering what anyone has done with most of the wires from the wiring harness on the driveres side when swapping out for a v8 i was thinking most can get cut cause most of them were for the 2.2 i figured the headlights and turnsignals and maarkers if u have them seems like pretty much that can go up any help would be grat thanks

almost none of the wires on the drivers side are for the engine, except the temp sensor and coil power. The main engine harness comes through the passenger side of the firewall and mostly go to the carburetor.

Most of the wires on the drivers side go to and from the main fuse box.